1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/* Copyright (C) 1995,1996,1999,2000,2001, 2003, 2004, 2006, 2008, 2009 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
/* This file and objects.h contains those minimal pieces of the Guile
* Object Oriented Programming System which need to be included in
* libguile. See the comments in objects.h.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "libguile/_scm.h"
#include "libguile/struct.h"
#include "libguile/procprop.h"
#include "libguile/chars.h"
#include "libguile/keywords.h"
#include "libguile/smob.h"
#include "libguile/eval.h"
#include "libguile/alist.h"
#include "libguile/ports.h"
#include "libguile/strings.h"
#include "libguile/vectors.h"
#include "libguile/programs.h"
#include "libguile/vm.h"
#include "libguile/validate.h"
#include "libguile/objects.h"
#include "libguile/goops.h"
SCM scm_metaclass_standard;
/* The cache argument for scm_mcache_lookup_cmethod has one of two possible
* formats:
*
* Format #1:
* (SCM_IM_DISPATCH ARGS N-SPECIALIZED
* #((TYPE1 ... ENV FORMALS FORM ...) ...)
* GF)
*
* Format #2:
* (SCM_IM_HASH_DISPATCH ARGS N-SPECIALIZED HASHSET MASK
* #((TYPE1 ... ENV FORMALS FORM ...) ...)
* GF)
*
* ARGS is either a list of expressions, in which case they
* are interpreted as the arguments of an application, or
* a non-pair, which is interpreted as a single expression
* yielding all arguments.
*
* SCM_IM_DISPATCH expressions in generic functions always
* have ARGS = the symbol `args' or the iloc #@0-0.
*
* Need FORMALS in order to support varying arity. This
* also avoids the need for renaming of bindings.
*
* We should probably not complicate this mechanism by
* introducing "optimizations" for getters and setters or
* primitive methods. Getters and setter will normally be
* compiled into @slot-[ref|set!] or a procedure call.
* They rely on the dispatch performed before executing
* the code which contains them.
*
* We might want to use a more efficient representation of
* this form in the future, perhaps after we have introduced
* low-level support for syntax-case macros.
*/
SCM
scm_mcache_lookup_cmethod (SCM cache, SCM args)
{
unsigned long i, mask, n, end;
SCM ls, methods, z = SCM_CDDR (cache);
n = scm_to_ulong (SCM_CAR (z)); /* maximum number of specializers */
methods = SCM_CADR (z);
if (scm_is_simple_vector (methods))
{
/* cache format #1: prepare for linear search */
mask = -1;
i = 0;
end = SCM_SIMPLE_VECTOR_LENGTH (methods);
}
else
{
/* cache format #2: compute a hash value */
unsigned long hashset = scm_to_ulong (methods);
long j = n;
z = SCM_CDDR (z);
mask = scm_to_ulong (SCM_CAR (z));
methods = SCM_CADR (z);
i = 0;
ls = args;
if (!scm_is_null (ls))
do
{
i += SCM_STRUCT_DATA (scm_class_of (SCM_CAR (ls)))
[scm_si_hashsets + hashset];
ls = SCM_CDR (ls);
}
while (j-- && !scm_is_null (ls));
i &= mask;
end = i;
}
/* Search for match */
do
{
long j = n;
z = SCM_SIMPLE_VECTOR_REF (methods, i);
ls = args; /* list of arguments */
if (!scm_is_null (ls))
do
{
/* More arguments than specifiers => CLASS != ENV */
if (! scm_is_eq (scm_class_of (SCM_CAR (ls)), SCM_CAR (z)))
goto next_method;
ls = SCM_CDR (ls);
z = SCM_CDR (z);
}
while (j-- && !scm_is_null (ls));
/* Fewer arguments than specifiers => CAR != CLASS or `no-method' */
if (!scm_is_pair (z)
|| (!SCM_CLASSP (SCM_CAR (z)) && !scm_is_symbol (SCM_CAR (z))))
return z;
next_method:
i = (i + 1) & mask;
} while (i != end);
return SCM_BOOL_F;
}
SCM
scm_mcache_compute_cmethod (SCM cache, SCM args)
{
SCM cmethod = scm_mcache_lookup_cmethod (cache, args);
if (scm_is_false (cmethod))
/* No match - memoize */
return scm_memoize_method (cache, args);
return cmethod;
}
SCM
scm_apply_generic (SCM gf, SCM args)
{
SCM cmethod = scm_mcache_compute_cmethod (SCM_GENERIC_METHOD_CACHE (gf), args);
if (SCM_PROGRAM_P (cmethod))
return scm_vm_apply (scm_the_vm (), cmethod, args);
else if (scm_is_pair (cmethod))
return scm_eval_body (SCM_CDR (SCM_CMETHOD_CODE (cmethod)),
SCM_EXTEND_ENV (SCM_CAR (SCM_CMETHOD_CODE (cmethod)),
args,
SCM_CMETHOD_ENV (cmethod)));
else
return scm_apply (cmethod, args, SCM_EOL);
}
SCM
scm_call_generic_0 (SCM gf)
{
return scm_apply_generic (gf, SCM_EOL);
}
SCM
scm_call_generic_1 (SCM gf, SCM a1)
{
return scm_apply_generic (gf, scm_list_1 (a1));
}
SCM
scm_call_generic_2 (SCM gf, SCM a1, SCM a2)
{
return scm_apply_generic (gf, scm_list_2 (a1, a2));
}
SCM
scm_call_generic_3 (SCM gf, SCM a1, SCM a2, SCM a3)
{
return scm_apply_generic (gf, scm_list_3 (a1, a2, a3));
}
void
scm_init_objects ()
{
#include "libguile/objects.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
|